Ryan McAvoy said:

...was fully filmed during principle photograhy on ROTS. But Lucas went back in during post-production and rewrote much of the dialogue and called his main cast back for pickups, to change Anakin's fall to be about losing Padme. All of this material is sitting on a tape somewhere in the Lucas archive but I doubt it will ever see the light of day.

I would love to see that version. I get that they thought it was missing some relatable emotional angle, but I don't think the movie recovered from being changed so much after the fact. It's like they skipped right to the Special Edition stage of fuckuppery without us ever getting to see the original.